The Camelbak Octane 18 X has been upgraded for 2011 & is a versatile & light pack designed to give you the optimum combination of hydration, organisation & comfort in an award winning design. Features a 70 D Ripstop pack body, air Channel back panel, air mesh ventilated Independent Suspension Harness, extra long waist belt pockets, central compression zip for enhanced stability/expandable cargo space, inner mesh pocket & zipped essentials pocket, twin elasticated pole holders & front & rear reflectivity. Weight exc. reservoir: 450 g. Hydration: 3.0 Litres Antidote with Quick Link System. Total capacity: 21 Litres.